Neighbour-joining tree of sampled locations based on pairwise RST. Analysis obtained from microsatellite data showing YUC group clustering together
in a basal position, and sampling localities of SMO group clustering in a geographically
unresolved clade. Sampled locations with only one individual were excluded from the
analysis.

Results of the coalescent-based simulation on phenotypic traits. Estimates of s of Slatkin and Maddison from 10,000 coalescent simulated gene trees to test the probability
of complete sorting of vocal characters (A and B) and morphological characters (C
and D) in wedge-tailed sabrewing populations. Regarding vocal characters, there is
a low probability of fixation in nuclear genes under neutrality regardless of the
assumption of dichotomous branching (A) or the simultaneous model of divergence (B).
In contrast, the probabilities that nuclear genes would be fixed under neutrality
are high for morphological characters, regardless of the assumption of dichotomous
branching (C) or the simultaneous model of divergence (D). This suggests that divergent
selection has caused the pattern of vocal variation among populations, but the null
hypothesis that morphological divergence resulted from drift was not rejected. Arrows
indicate the expected value of s in a completely sorted tree.

Alignment of ATPase 6-8 and control region mtDNA sequences. Alignment of the concatenated ATPase 6-8 (1-875 bp) and control region (876-1407
bp) mtDNA sequences for 160 individuals of Campylopterus curvipennis and three outgroups used in the phylogenetic analyses.